D21D 5/04
Flat screens
D21D5/04 (Flat screens) appears on 55 US grants and 21 published applications in this corpus.
Search patents in D21D- Granted patents
- 55
- Published applications
- 21
- Assignees
- 40
- Inventors
- 101
- Latest grant
- 30 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 3 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 3 | 0 |
| 1987 | 4 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 3 | 0 |
| 1991 | 2 | 0 |
| 1992 | 3 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 4 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 1 | 1 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 1 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 2 |
| 2014 | 0 | 0 |
| 2015 | 1 | 1 |
| 2016 | 0 | 0 |
| 2017 | 1 | 1 |
| 2018 | 0 | 2 |
| 2019 | 3 | 2 |
| 2020 | 0 | 1 |
| 2021 | 1 | 2 |
| 2022 | 1 | 0 |
| 2023 | 0 | 2 |
| 2024 | 2 | 2 |
| 2025 | 2 | 1 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- System and method for fiber cleaning, alignment, and sizing30 Jun 2026US 12,668,919 B1
- Separation device and sheet manufacturing apparatus12 May 2026US 12,624,499 B2Seiko Epson Corporation
- Screen plate and pulp screening machine30 Dec 2025US 12,509,823 B2ANDRITZ (China) Ltd.
- Multistage screen sorting device4 Mar 2025US 12,239,997 B2Voith Patent GmbH
- Process for producing a nanocelullosic material comprising at least two stages of defibrillation of cellulosic feedstock and at least one intermediate fractioning stage22 Oct 2024US 12,123,143 B2Suzano S.A.
- Method for operating a pulper for producing a suspension, in particular a fibrous suspension24 Jul 2025US 2025/0237012 A1Voith Patent GmbH
- Filter Sector for a Filter Disc and Disc Filter With a Filter Sector21 Mar 2024US 2024/0091684 A1Andritz Inc.
- Multistage screen sorting device29 Feb 2024US 2024/0066527 A1Voith Patent GmbH
- Separation device and sheet manufacturing apparatus13 Jul 2023US 2023/0220619 A1Seiko Epson Corporation
- Screen Plate and Pulp Screening Machine2 Mar 2023US 2023/0060403 A1ANDRITZ (China) Ltd.
Most cited
By later US patents
- Method for screening pulp47US 5,601,690 AGauld Equipment Company · 1997
- Screen segment for filters for thickening fiber suspensions42US 4,950,403 A1990
- Pulp screen35US 4,613,432 ASweco, Incorporated · 1986
- Method of and device for fractionating suspensions23US 5,124,029 AAB Celleco · 1992
- Screening device16US 4,680,108 AKamyr, Inc. · 1987